摘要
分析了基于相关函数的频偏估计算法,鉴于其频偏估计范围较小,且多普勒频偏影响较大的缺点,提出了一种可以忽略频率偏移的基于正交分解的载波解调算法.仿真结果表明,正交解调算法对于AM调制的OFDM信号比较适用,不仅可以忽略频差,而且可以工作在信噪比较低的信道中.
This paper analyzes the calculation for frequency offset relative to given functions. It is found that it has a smaller range of frequency offset and can be easily attested by Doppler frequency offset. Considering this, the paper introduces a calculation method of carrier demodulation based on the orthogonal algorithm, n which the frequency offset can be omitted. The results of Computation simulation indicates that the orthogonal demodulation is applicable to the AM modulated OFDM signal, in that not only can frequncy offset be ignored in it, but it can be available in the channel with a low SNR.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第4期648-651,共4页
Journal of Xidian University
基金
国家自然科学基金资助项目(40174032)
关键词
频率偏移
伪随机序列
正交解调
frequency offset
pseudo-random sequence
orthogonal demodulation
